Catriel Beeri, Ronald Fagin, et al.
Journal of the ACM
Catriel Beeri, Ronald Fagin, et al.
Journal of the ACM
Marco Carmosino, Ronald Fagin, et al.
Logical Methods in Computer Science
Ziv Bar-Yossef, T.S. Jayram, et al.
Journal of Computer and System Sciences
Cynthia Dwork, Ravi Kumar, et al.
WWW 2001